Wireless Power Receiver Resonance Frequency Adjustment
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Solution Overview
Problem
Wireless power charging systems face inefficiencies due to varying distances between source and target resonators, leading to impedance mismatching and decreased power transfer efficiency.
Innovation Solution
A portable device with a power receiving unit, voltage generator, controller, and communication unit that adjusts resonance frequency and impedance of the target resonator to match the source resonator, and performs communication functions using wake-up voltage, enabling efficient energy transfer and battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between source resonator and target resonator varies, then the wireless power charging system can accommodate different positions, but impedance mismatching occurs and power transfer efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the resonance frequency adjustable rather than fixed. The controller dynamically adjusts the resonance frequency of the target resonator based on the detected distance or coupling condition with the source resonator, allowing the system to adapt to varying positions while maintaining optimal power transfer efficiency.
Solution Approach 2:
The patent changes the parameter of resonance frequency to resolve the contradiction. By varying the resonance frequency parameter of the target resonator according to the distance between source and target, the system maintains impedance matching and high power transfer efficiency across different positions.
2Loss of energy
If resonance frequency is adjusted to match source resonator, then power transfer efficiency improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent uses feedback by having the controller detect the distance or coupling condition between source and target resonators, then adjust the resonance frequency accordingly. This closed-loop feedback mechanism automatically maintains optimal power transfer efficiency without requiring complex manual adjustment or overly sophisticated control systems.
Solution Approach 2:
The system performs self-adjustment of resonance frequency through the controller that automatically detects coupling conditions and modifies the target resonator's frequency. This self-service capability eliminates the need for external calibration or complex manual intervention, balancing efficiency improvement with acceptable device complexity.
3Ease of operation
If first energy is used to activate controller and communication unit, then communication function is enabled, but less energy remains for battery charging
Solution Approach 1:
The patent segments the received wireless energy into two distinct paths: first energy (wake-up signal) for activating the controller and communication unit, and second energy for battery charging. This segmentation allows the system to perform communication functions while preserving separate energy allocation for charging, managing the energy trade-off between operation and storage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances power transfer efficiency by dynamically matching resonance frequencies and impedances, allowing continuous communication and charging even when battery power is low, and prevents collisions among multiple targets through anti-collision communication protocols.
Implementation Method 1
The power receiving unit may include a target resonator configured to form a magnetic coupling with a source resonator of the wireless power transmitter
Implementation Method 2
Magnetic coupling or resonance coupling may be formed between the source resonator and the target resonator
Implementation Method 3
The voltage generator may include an alternating current (AC)-to-direct current (DC) (AC/DC) inverter configured to generate the wake-up voltage by rectifying the first energy
Data Source
AI summary
A portable device is provided. The portable device includes a power receiving unit configured to receive a first energy or a second energy from a wireless power transmitter, the first energy being used to perform a communication function and a control function, the second energy being used to charge a battery, and the wireless power transmitter being configured to wirelessly transmit a power, a voltage generator configured to generate a wake-up voltage from the first energy, or to generate a voltage for charging the battery from the second energy, a controller configured to perform the communication function and the control function, the controller being activated by the wake-up voltage, and a communication unit configured to perform a communication with the wireless power transmitter based on a control of the controller.